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Date: Thu, 06 Jul 2006 09:13:46 +0200
From: Jan Kiszka <jan.kiszka@domain.hid>
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Subject: Re: [Xenomai-help] FPU not available in user-space programs
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To: Rodrigo Rosenfeld Rosas <lbocseg@domain.hid>
Cc: xenomai@xenomai.org

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Rodrigo Rosenfeld Rosas wrote:
> Hi,
>=20
> I was looking at /proc/xenomai/faults and noticed that the only errors
> were on TRAP 7 (FPU not available).
>=20
> Each time I run the user-space program using the native skin, I
> increment the fault by one. I don't understand why this happens. From
> documentation, FPU should be enabled automatically for user-space progr=
ams.
>=20
> Any ideas why I'm getting this error and what does it mean? Should I do=

> some float-point operation before creating my real-time tasks?
>=20

Watch out for the thread "T_FPU without effect" on xenomai-core, I
stumbled over this some time ago as well. It's an initial fault that
happens only on first FPU usage from user-space.

I'm not up-to-date with its current state, i.e. if there are plans to
solve this differently. Maybe Gilles or Philippe can comment on it.

Jan


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